Code for thread on SFML forums

main.cpp

//main.cpp file
#include <iostream>
#include <Box2D/Box2D.h>
#include <SFML/Graphics.hpp>
#include <ctime>
#include <string>
#include <stdio.h>
#include <vector>
#include "SFMLDebugDraw.h"

const float PPM = 30.0f;
// 30 pixels is 1 meter

using namespace std;
using namespace sf;



int main()
{
	float timeStep = 1 / 60.0f;

	// dimensions of the drawn SFML body
	float width = 160.f;
	float height = 40.f;

	sf::RenderWindow app(sf::VideoMode(800,600),"Application");

	b2Vec2 gravity(0.0f, 10.f); // Y-axis / coordinate increases downward

	b2World world(gravity);

	world.SetAllowSleeping(true);

	//start object setup

	//SFML object
	sf::RectangleShape rect( Vector2f( width, height ) );
	rect.setFillColor( Color( 255, 0 , 133) );
	//rect.setPosition( width, height);
	rect.setOrigin( width / 2 , height / 2 );

	//Box2D object
	b2BodyDef rectBodyDef;
	rectBodyDef.type = b2_staticBody;
	rectBodyDef.position.Set(width/PPM, height/PPM);
	b2PolygonShape bx2dRectShape;
	bx2dRectShape.SetAsBox( ( width / 2) / PPM, ( height / 2) / PPM , b2Vec2(0,0) , 0);

	cout << ( width / 2) <<  " " << ( height / 2) << endl;

	b2FixtureDef rectBodyFix;
	rectBodyFix.density = 2.f;
	rectBodyFix.shape = &bx2dRectShape;

	b2Body* bx2dRectBody = world.CreateBody( &rectBodyDef );
	bx2dRectBody->CreateFixture( &rectBodyFix );

	//end object setup

	rect.setPosition( bx2dRectBody->GetPosition().x * PPM , bx2dRectBody->GetPosition().y * PPM );

	SFMLDebugDraw debugDraw(app);
	
	debugDraw.SetFlags(b2Draw::e_shapeBit);

	world.SetDebugDraw( &debugDraw ); 

	sf::Clock fpsClock;

	while(app.isOpen())
	{
		
		sf::Event event;
		while (app.pollEvent(event))
		{
			if (event.type == sf::Event::Closed)
				app.close();
		}

		

		if ( fpsClock.getElapsedTime().asMilliseconds() >= 16 ) //16 ms = 1/60 or 60 FPS
		{
			world.Step(timeStep,10,10);
		}

		app.clear();

		app.draw(rect);

		world.DrawDebugData();

		app.display();

	}

	return 0;
}